Add some tests for XPathUtil
Add some tests for XPathUtil

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1780115 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 831a5a693114a8760709c25066d51db11093d7c2
apache/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,benbenw/jmeter,ham1/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter